Can you confirm that you're running 1.7? (It says at the bottom right of the Launcher).

I'm looking into this problem, but I'm stuck right now. If you' d like to test a couple of things, open

program files/determinance/dt/client/prefs.cs

It's just possible that changing one of the settings starting $pref::Video and $pref::OpenGL might work. Now obviously you probably don't want to do that but I'm just giving you the option while I look into it here. This sounds like an old ATI issue so I'm suprised you're getting it with these drivers.

Can you try turning everything that looks like it can be turned off, off? Everything that has $pref::video::someFeature = 1; changing that to = 0 may help. A massive pain, but trying a slightly older version of Catalyst (if that's even possible) might be useful.

I'm getting a blank so far on this, but am still looking. Of course if you have purchased the full version of Determinance and we can't resolve this issue we will give you a full refund.